March 14th, 2025

'Once in a Century' Proof Settles Math's Kakeya Conjecture

A new proof has resolved the Kakeya conjecture in three dimensions, confirming the Minkowski dimension of a Kakeya set is three, impacting harmonic analysis and related conjectures.

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'Once in a Century' Proof Settles Math's Kakeya Conjecture

A new proof has resolved the Kakeya conjecture in three dimensions, a problem that has challenged mathematicians for over 50 years. The conjecture, posed by Sōichi Kakeya in 1917, asks for the minimum volume that can be swept by a pencil-like object as it points in every direction. The recent proof by Hong Wang and Joshua Zahl establishes that the Minkowski dimension of a Kakeya set must be three, confirming that the volume cannot be reduced below a certain threshold. This breakthrough is significant for harmonic analysis, as it supports a series of related conjectures in the field. The proof builds on previous work and employs a novel approach involving the concept of "graininess" in sets, allowing the authors to demonstrate that no Kakeya set can exist with a dimension less than three. This resolution opens new avenues for research and problem-solving in higher dimensions, with implications for other mathematical conjectures. The four-dimensional Kakeya conjecture remains unsolved, but the techniques developed in this proof may be applicable to future explorations in that area.

- The Kakeya conjecture in three dimensions has been proven after 50 years of research.

- The proof establishes that the Minkowski dimension of a Kakeya set is three.

- This result has significant implications for harmonic analysis and related mathematical conjectures.

- The proof utilized a new approach involving the concept of "graininess" in sets.

- The four-dimensional Kakeya conjecture remains open for further investigation.

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By @hyperbrainer - about 1 month
What does "once in a century" mean? This is a great accomplishment, and the first proof, but we have dozens of _extremely_ impressive results each century and hundreds more impressive ones.